获得和裁剪图片

take big picture ,select picture from gallery and crop picture.

1. 照相获得大图片：

照相时，把图片保存到文件中， 可以得到大图片（分辨率很高的图片）， 具体方法：

Intent intent 	 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
					
					mImageCaptureUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),
									   "tmp_avatar_" + String.valueOf(System.currentTimeMillis()) + ".jpg"));

					intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);

					try {
						intent.putExtra("return-data", true);
						
						startActivityForResult(intent, PICK_FROM_CAMERA);
					} catch (ActivityNotFoundException e) {
						e.printStackTrace();
					}

2. 从图库中选择图片：

直接从图库取得图片, 具体方式：

                        Intent intent = new Intent();
					
	                intent.setType("image/*");
	                intent.setAction(Intent.ACTION_GET_CONTENT);
	                
	                startActivityForResult(Intent.createChooser(intent, "Complete action using"), PICK_FROM_FILE);

3. 裁剪图片：

首先是已经取得原始图片，然后是检查系统中是否存在裁剪图片的应用，最后是裁剪完成，具体实现：

final ArrayList<CropOption> cropOptions = new ArrayList<CropOption>();
    	
    	Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setType("image/*");
        //获得目标应用的个数
        List<ResolveInfo> list = getPackageManager().queryIntentActivities( intent, 0 );
        
        int size = list.size();
        
        if (size == 0) {	        
        	Toast.makeText(this, "Can not find image crop app", Toast.LENGTH_SHORT).show();
        	
            return;
        } else {
        	intent.setData(mImageCaptureUri);
            
            intent.putExtra("outputX", 200);
            intent.putExtra("outputY", 200);
            intent.putExtra("aspectX", 1);
            intent.putExtra("aspectY", 2);
            intent.putExtra("scale", true);
            intent.putExtra("return-data", true);
            
        	if (size == 1) {
        		Intent i 		= new Intent(intent);
	        	ResolveInfo res	= list.get(0);
	        	
	        	i.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
	        	
	        	startActivityForResult(i, CROP_FROM_CAMERA);
        	} else {
		        for (ResolveInfo res : list) {
		        	final CropOption co = new CropOption();
		        	
		        	co.title 	= getPackageManager().getApplicationLabel(res.activityInfo.applicationInfo);
		        	co.icon		= getPackageManager().getApplicationIcon(res.activityInfo.applicationInfo);
		        	co.appIntent= new Intent(intent);
		        	
		        	co.appIntent.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
		        	
		            cropOptions.add(co);
		        }
	        
		        CropOptionAdapter adapter = new CropOptionAdapter(getApplicationContext(), cropOptions);
		        
		        AlertDialog.Builder builder = new AlertDialog.Builder(this);
		        builder.setTitle("Choose Crop App");
		        builder.setAdapter( adapter, new DialogInterface.OnClickListener() {
		            public void onClick( DialogInterface dialog, int item ) {
		                startActivityForResult( cropOptions.get(item).appIntent, CROP_FROM_CAMERA);
		            }
		        });
	        
		        builder.setOnCancelListener( new DialogInterface.OnCancelListener() {
		            @Override
		            public void onCancel( DialogInterface dialog ) {
		               
		                if (mImageCaptureUri != null ) {
		                    getContentResolver().delete(mImageCaptureUri, null, null );
		                    mImageCaptureUri = null;
		                }
		            }
		        } );
		        
		        AlertDialog alert = builder.create();
		        
		        alert.show();
        	}
        }

4. 显示最后的图片：

从Intent中获取图片，并显示：

 Bundle extras = data.getExtras();
	
		        if (extras != null) {	        	
		            Bitmap photo = extras.getParcelable("data");
		            
		            mImageView.setImageBitmap(photo);
		        }
	
		        File f = new File(mImageCaptureUri.getPath());            
		        
		        if (f.exists()) f.delete();
	
		        break;

其他的代码：

简单Adapter：显示用户可以做的操作

package net.londatiga.android;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import android.content.Context;

import java.util.ArrayList;

/**
 * Adapter for crop option list.
 * 
 * @author Lorensius W. L. T <lorenz@londatiga.net>
 *
 */
public class CropOptionAdapter extends ArrayAdapter<CropOption> {
	private ArrayList<CropOption> mOptions;
	private LayoutInflater mInflater;
	
	public CropOptionAdapter(Context context, ArrayList<CropOption> options) {
		super(context, R.layout.crop_selector, options);
		
		mOptions 	= options;
		
		mInflater	= LayoutInflater.from(context);
	}
	
	@Override
	public View getView(int position, View convertView, ViewGroup group) {
		if (convertView == null)
			convertView = mInflater.inflate(R.layout.crop_selector, null);
		
		CropOption item = mOptions.get(position);
		
		if (item != null) {
			((ImageView) convertView.findViewById(R.id.iv_icon)).setImageDrawable(item.icon);
			((TextView) convertView.findViewById(R.id.tv_name)).setText(item.title);
			
			return convertView;
		}
		
		return null;
	}
}

CropOption.java //记录应用的一些属性

public class CropOption {
	public CharSequence title;
	public Drawable icon;
	public Intent appIntent;
}